Tag Archives: air compressor

If you work in a telecommunication company or a dental office, you’ve definitely heard of an air dryer. No, not a hairdryer, but an air dryer. Most of us are familiar with the former, while very few of us know what an air dyer is or its function. This is a necessity for the success and efficiency of an industrial facility that requires a constant supply of compressed air. Don’t worry; we got you covered, and we are here to explain what it is and everything you need to know about it.

What is an Air Dryer?


It is a piece of machinery or equipment that protects an air compressor from excess moisture that may be present in the air and may deter the proper functioning of your air compressor. They are also used to dehumidify compressed air and can significantly reduce the dew point of compressed air to 18°f lower than the actual temperature of the building/site. However, the function of your air dryer depends on the type of compressor that is present on your site and needs to be maintained regularly. The main types of air dryers used alongside compressed air systems are:

    • Membrane dryers
    • Desiccant dryers
    • Refrigerated dryers

1. Refrigerated Dryers

This is the most common air dryer out there because it is the easiest system to clean and maintain. They are also very cost-effective and are your best option if your equipments don’t need specific requirements like minimum dew point. It works like your average fridge or AC system and de-humidifies air by cooling it, condescending it and draining the subsequent moisture off. There are two types of these, namely the cycling and non-cycling types.

Non-cycling Type

This type of air dryer continuously circulates through the system and never shuts off, unlike its cycling counterpart. The airflow is regulated by using an unloader valve or bypass that matches the volume of compressed air entering the system, and this helps maintain a stable operating temperature.

Cycling Type

This one cools liquid or solid masses, which surrounds an air inlet of a heater exchanger. The solid mass tends to be a metal block or glycerol, which act as heat sinks that help the air compressors cool down. A thermostat is also used to regulate the air compressor, and when the compressor has zero or partial loads, it shuts down and acts as an energy saver.

2. Membrane Air Dryer

As its name suggests, this system uses semi-permeable membrane fibres that separate moisture from compressed air. This type of air dryer is gaining in popularity because it is very environmentally friendly. It also doesn’t require any electricity to run and is usually less expensive to install and maintain since they have no moving parts. They also take up less space, are the quietest air dryers on the market and our list, and are suitable for low-volume air separation.

3. Desiccant Air Dryer

This one is made of two towers, while a lesser-known variant only has one tower/compartment. One of the towers contains a desiccant that removes all moisture from the air system, which comes from the compressor, while the other regenerates the desiccant. 

The single tower desiccant dryer only consists of desiccant materials that dry the air coming from the surrounding environment. This system also doesn’t contain any mechanical parts, so it doesn’t need electricity to function and is optimal for corrosive and hazardous environments.


Air dryers are essential for the proper running of an industrial or commercial complex as atmospheric air typically contains a percentage of water vapour in them. This can create problems for your equipment and may have adverse effects on the final products if they are exposed to a high amount of vapour, leading them to corrode over time. This is why you need an air dryer to prevent any of this to happen further down the line.

Contact Promptair & Electrical Pty Ltd for all your commercial and industrial maintenance and supply of air compressor, dryer and even air filtration services. With Over 40 years in the field, trust their team to maintain and install your air compressors and accessories.

Air compressor troubleshooting

You will find below a list of common problems you may face with your air compressor and the respective fixes:

1.Problem: The Air Compressor Is Not Working

There are several things that can cause an air compressor to not operate. The problem can come from a basic problem or simple oversight. Luckily, these problems are typically easy to detect and solve.


  1. No electrical power
    This one is pretty straightforward: no electrical power means that the air compressor won’t operate. So, check the breakers, check the power button and activate the reset switch if needed.
  2. Not enough oil
    A nearly empty oil tank can cause the air compressor to stop working. To ensure that there is no lack of oil, remember to check or change the fluids.
  3. The tank pressure is too low
    The pressure in the tank has to be compared to the cut-in pressure to know if there really is a disparity. If it is too low, replace the pressure switch for one with reduced cut-in.
  4. Lack of contact between the pressure switch and inner circuitry
    The problem can be as simple as power switch failure. You can try adjusting the pressure switch to see if it works. If nothing happens, it might be time to call in a technician for maintenance.

2.Problem: The Fuses Do Not Last as Long as They Should

If the fuses in the compressors fail to last through their expected lifespan, you are looking at a problem with fuse size or voltage. But you should know that unloader, valve and belts can sometimes cause the same kind of issue.


Here’s what you can try:

  1. Check the fuse size.
    If the incorrect fuse size has been used, it means that the fuse used doesn’t have the right ampere rating for the compressor. You always want to check the rating before purchasing fuses.
  2. Check the voltage.
    Low voltage means that an insufficient amount of power is being delivered to the fuses. Check the voltage requirements and, if necessary, raise the level accordingly.
  3. Check the unloader.
    A faulty unloader can cause the fuse to fail repeatedly. If it is the unloader, you’ll probably have to get them replaced.
  4. Have a look at the check valves.
    Defective or expired check valves will cause the fuses to fail if not replaced.
  5. Check the belt.
    If the belt is too tight, loosen it. A tensed belt can lead to blown fuses.

3.Problem: The Reset Mechanism Cuts Abruptly and Recurrently

Frequent cuts in the reset mechanism occur mostly for two reasons: an overloaded motor or inappropriate surrounding temperature.


The solution will vary according to the cause of the issue. If you think the problem comes from an overworked motor, shut it down promptly and get a technician on-site as soon as possible. If you think high temperatures or humid surroundings are the sources of the problem, try to boost ventilation in the area that surrounds your compressor.

4.Problem: The Compressor Runs Out of Steam Really Fast

The motor can cause the compressor to get bogged down, hence causing it to work well only for short durations.


The key is to find solutions that stop the compressor from prematurely run out of steam. The following can be helpful:

  1. Ensure that the power of an outlet is dedicated solely to the compressor.
  2. Compressors must get full power sources at all times. So, check that the air compressor gets the undivided power of at least a 15-20 amp breaker.
  3. Manually enact the valve function to check that unloader valves are functioning properly. If the compressor still quickly runs out of steam after you drained out the air and water, the valve needs to be replaced.

5.Problem: You Can See Milky Oil in the Reservoir

Compressor oil that has taken on a milky color is an obvious sign of one problem: Water having penetrated the reservoir. Water can enter the reservoir through condensation. And once it does, the oil held within will go milky. When compressor oil takes on a milky color, water has made its way into the reservoir via condensation. This would indicate that operating conditions have been too hot for the compressor. For an instant remedy, you have two options:


The problem is coming from the compressor exposed to too warm of an environment. Here’s what you can do:

  1. You can start by moving the air intake pipe to a cooler area.
  2. Ensure, you drain the tank every day.

6.The Simpler Answer: Find a Trustworthy Supplier of Air Compressors in Your Locality

The best way to ensure that your compressor is always in top shape is by scheduling regular maintenances. If you live in Victoria, you may want to consider Promptair & Electrical Pty Ltd . They are not only renowned suppliers of air compressors, but they also provide reliable installation and maintenance.

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